We are here with discussing Voice Networks, specifically, Two-Way Radio Networks. We can provide general coverage at place using repeater(s) at one or multiple locations depending on the size and coverage requirement. However, many a times signals are available generally in most of the area but not inside some rooms or structures. However, it is important to provide the connectivity. Therefore, to overcome the problem we can install Amplifiers. The work of an Amplifier is to take signal from an area where quality signals are available and spread it in signal-less area. One or more amplifiers may be required depending on the size of the area to cover. Also, these are available for both networks with Repeaters (Semi-Duplex) or for repeater less requirements(Simplex.)